Last Known Eruption
37d 2h 9m ago

Latest Eruptions

Eruption DurationInterval
15 Apr 2024 @ 0850 ie64d 19h 56m
10 Feb 2024 @ 1154 ie23d 21h 24m
17 Jan 2024 @ 1430 ie83d 6h 6m
26 Oct 2023 @ 09244d 19h 2m
21 Oct 2023 @ 1422 ie4h 59m
21 Oct 2023 @ 09239d 22h 48m
11 Oct 2023 @ 1035 ie1d 22h 42m
09 Oct 2023 @ 1153 ie23h 30m
08 Oct 2023 @ 1223 ie9d 1h 44m
29 Sep 2023 @ 1039 ie1d 17h 29m
27 Sep 2023 @ 1710 ie4d 1h 35m
23 Sep 2023 @ 1535 ie5d 8h 17m
18 Sep 2023 @ 0718 ie6d 18h 10m
11 Sep 2023 @ 1308 ie20h 47m
10 Sep 2023 @ 1621 ie20h 15m
09 Sep 2023 @ 2006 ie4d 23h 26m
04 Sep 2023 @ 204013h 50m
04 Sep 2023 @ 0650 ie4d 21h 1m
30 Aug 2023 @ 09493d 22h 31m
26 Aug 2023 @ 11188d 37m
18 Aug 2023 @ 1041 ie3d 2h 24m
15 Aug 2023 @ 08172d 11h 28m
12 Aug 2023 @ 2049 ie8d 8h 9m
04 Aug 2023 @ 1240 ie5d 7h 31m
30 Jul 2023 @ 0509 ie19h 48m
29 Jul 2023 @ 0921 ie4d 20h 8m
24 Jul 2023 @ 1313 ie17h 29m
23 Jul 2023 @ 1944 ie12d 3h 47m
11 Jul 2023 @ 15574d 2h 16m
07 Jul 2023 @ 1341 ie7d 18h 28m
29 Jun 2023 @ 19133d 2h 2m
26 Jun 2023 @ 171110h 58m
26 Jun 2023 @ 0613 ie11d 15h 50m
14 Jun 2023 @ 142321h 21m
13 Jun 2023 @ 1702 ie3d 22h 57m
09 Jun 2023 @ 1805 ie1d 9h 38m
08 Jun 2023 @ 0827 ie16h 57m
07 Jun 2023 @ 1530 ie>5d 4h 35m
02 Jun 2023 @ 10556d 14h 51m
26 May 2023 @ 2004 ie3h 33m
26 May 2023 @ 16314d 57m
22 May 2023 @ 1534 ie20h 6m
21 May 2023 @ 1928 ie3d 3h 47m
18 May 2023 @ 1541 ie9d 6h 28m
09 May 2023 @ 0913 ie4d 13h 39m
04 May 2023 @ 1934 ie3d 3h 49m
01 May 2023 @ 15453h 13m
01 May 2023 @ 1232 ie22h 44m
30 Apr 2023 @ 1348>4h 57m 7d 12m
23 Apr 2023 @ 133698d 1h 45m
15 Jan 2023 @ 105170d 1h 29m
06 Nov 2022 @ 0922 ie15d 19h 31m
21 Oct 2022 @ 1451 ie6d 22h 5m
14 Oct 2022 @ 16463h 43m
14 Oct 2022 @ 130314d 20h 44m
29 Sep 2022 @ 161911d 2h 20m
18 Sep 2022 @ 1359 ie5d 23m
13 Sep 2022 @ 1336 ie4d 2h 35m
09 Sep 2022 @ 110112d 3h 9m
28 Aug 2022 @ 075240m 22h 10m
27 Aug 2022 @ 09424d 1h 42m
23 Aug 2022 @ 080042m 13h 20m
22 Aug 2022 @ 18402d 11h 48m
20 Aug 2022 @ 0652 ie12h 19m
19 Aug 2022 @ 18336d 7h 50m
13 Aug 2022 @ 104313h 23m
12 Aug 2022 @ 2120 ie10d 7h 0m
02 Aug 2022 @ 1420 ? ie wc10d 17h 45m
22 Jul 2022 @ 2035 ie11h 4m
22 Jul 2022 @ 0931 ie1h 41m
22 Jul 2022 @ 0750 ie4d 15h 15m
17 Jul 2022 @ 1635 ie6h 39m
17 Jul 2022 @ 09561h 5m 15h 6m
16 Jul 2022 @ 1850>2h 10m 3d 22h 30m
12 Jul 2022 @ 20204d 13h 51m
08 Jul 2022 @ 06294d 20h 18m
03 Jul 2022 @ 1011 ie3d 14h 12m
29 Jun 2022 @ 1959 ie10h 2m
29 Jun 2022 @ 09574d 18h 29m
24 Jun 2022 @ 1528 ie5d 22h 39m
18 Jun 2022 @ 1649 ie1d 7h 3m
17 Jun 2022 @ 094610d 18h 1m
06 Jun 2022 @ 15453d 21h 31m
02 Jun 2022 @ 1814 ie2d 28m
31 May 2022 @ 17461d 22h 24m
29 May 2022 @ 19222d 20m
27 May 2022 @ 1902 ie8d 12h 30m
19 May 2022 @ 0632 ie1d 22h 59m
17 May 2022 @ 0733 ie8d 15h 57m
08 May 2022 @ 1536 ie1d 18h 59m
06 May 2022 @ 203714d 1h 35m
22 Apr 2022 @ 1902 ie49d 1h 35m
04 Mar 2022 @ 1627 ie3 burst2h 27m
04 Mar 2022 @ 1400 ie40d 20h 33m
22 Jan 2022 @ 1727 ini9d 1h 56m
13 Jan 2022 @ 153182d 6h 3m
23 Oct 2021 @ 10285d 15m
18 Oct 2021 @ 1013 ie9d 22h 8m
08 Oct 2021 @ 1205 ie1d 22h 8m
06 Oct 2021 @ 13575h 12m

Interval Statistics

Interval Count100
Min1h 41m
Max98d 1h 45m
Mean9d 5h 16m
Median4d 1h 59m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
34455 05 May 2024 @ 1844 --- Ajw Deep drain with good steam. Start refilling rapidly with audible slashing at 1847.
28517 27 Sep 2023 @ 1708 --- User34 Still in overflow, now with both vents boiling
28514 27 Sep 2023 @ 1514 --- User34 Overflowing with water all the way down the runoff channel. Boiling from left side. Was nearing overflow at 1454.
28436 24 Sep 2023 @ 0834 --- CraigC started overflow
28428 23 Sep 2023 @ 1410 --- CraigC started overflow
28341 19 Sep 2023 @ 1021 --- CraigC completely drained
28220 11 Sep 2023 @ 1142 --- Darcie In overflow, left vent bubbling
28192 10 Sep 2023 @ 1552 --- Colin_W In overflow and bubbling.
28113 08 Sep 2023 @ 1159 --- CraigC in overflow, left vent boiling
28086 07 Sep 2023 @ 1313 --- CraigC in overflow, strong boiling in left vent
27966 03 Sep 2023 @ 0806 --- CraigC rising, near full, left vent boiling
27927 02 Sep 2023 @ 0926 --- CraigC pool near full, boiling began in right vent. 0930 middle vent began boiling
27923 02 Sep 2023 @ 0900 --- CraigC at 0853 pool was drained and quiet, at 0757 pool is rising and left vent is boiling strong
27863 30 Aug 2023 @ 0917 --- CraigC both vents boiling
27857 30 Aug 2023 @ 0735 --- CraigC pool high, left vent boiling. 0758 in overflow
27706 20 Aug 2023 @ 1740 20 Aug 2023 @ 1855 BrianR All three vents on but did not produce a single eruptive burst
27407 04 Aug 2023 @ 1240 04 Aug 2023 @ 1321 Mikemcc 2 nice bursts to 25-30 feet during this time
27191 24 Jul 2023 @ 0740 --- deanl boiling and probably ie or building to an eruption
27014 11 Jul 2023 @ 1557 11 Jul 2023 @ 1835 minissa We left at 1835 had a wonderful day in the Grotto area. Nearly walked up on GF, which had quite decent height considering the short lead time it had on Grotto. I never realized Spa had quite this eruptive potential, 😁
26681 26 Jun 2023 @ 0743 --- BrianR End of eruption
26293 13 Jun 2023 @ 1825 --- Dan A Another awesome full pool eruption. Many bursts to the top of the trees including one multi burst where nearly every burst was to the top of the trees. Hopefully these strong full pool eruptions continue.
26134 07 Jun 2023 @ 1830 --- SantaFe108 Winding down.
23902 18 Sep 2022 @ 1535 --- User34 Still ie
23887 18 Sep 2022 @ 0735 --- RLJones spa in overflow, both vents active
23626 07 Sep 2022 @ 1725 --- Graham In overflow, Grotto off. 1806 dropped a lot.
23624 07 Sep 2022 @ 1441 --- CP Rising. Light boil.
23623 07 Sep 2022 @ 1356 --- CP Level low. Calm.
23286 19 Aug 2022 @ 2112 --- BrandonC Still ie, good bursts still
23159 13 Aug 2022 @ 0950 13 Aug 2022 @ 1011 Art Low pool, almost constantly boiling (erupting?) out of left (north) vent about 1-2 feet
22928 29 Jul 2022 @ 1100 --- rbwhitaker calm and in overflow
21910 10 Jun 2022 @ 2131 --- Forestbewithyou Below overflow and calm
21720 04 Jun 2022 @ 1109 --- Detour66 Water level approximately 3 feet lower then previous observation, no vent activity.
21716 04 Jun 2022 @ 0947 --- Detour66 Bubbling from one vent, and slowly filling at 09:47
21552 28 May 2022 @ 1145 --- Graham Full with strong single boil. No change by 1353.
21312 16 May 2022 @ 1124 --- Brando Since the last observation, spa has dropped ~2 feet and no more bubbling
21309 16 May 2022 @ 1048 --- Brando Pool nearly full and boiling from left vent
19910 06 Oct 2021 @ 1001 --- Darcie NO visible water at all
19490 11 Sep 2021 @ 1909 --- Graham still ie at this time.
19479 11 Sep 2021 @ 1610 --- User34 Three points of boiling and about to start overflowing
18677 27 Jul 2021 @ 0346 --- Kyle full and overflowing. rail and adjacent bike path are wet
17856 16 Jun 2021 @ 1925 16 Jun 2021 @ 1956 CrisG water rising post Grotto. Boiling from up to 2 vents. Vents stopped just as overflow was starting at 1954. Pool now dropping..
17679 11 Jun 2021 @ 0845 --- TheHikingDude Spa was 2 feet below overflow. No boils or bubbling. Just as quiet as the Grotto platform
17542 07 Jun 2021 @ 2058 --- Craigmon99 Off and low
17499 06 Jun 2021 @ 0640 --- CraigC low pool, North vent boiling vigorously, small bubbling from southern most vent. 649 boiling began on middle vent
17480 05 Jun 2021 @ 1653 --- CraigC start of overflow
17471 05 Jun 2021 @ 0934 --- CraigC went into overflow
17432 04 Jun 2021 @ 1227 --- CraigC in overflow
16908 22 Apr 2021 @ 1621 --- Micah Kipple All three vents have turned on. Just waiting for the first burst.
16435 15 Oct 2020 @ 1840 15 Oct 2020 @ 1915 William pool level barely within view. viewed at 18:40 and then again at 19:15.
16263 26 Sep 2020 @ 1504 --- Ajw pool full with mild bubbling in center.
16249 24 Sep 2020 @ 1905 --- William water level barely visible in crater, runoff area contains water in a few areas
16205 20 Sep 2020 @ 1115 --- William starting to boil from NV and rise from about 2' below inner rim
16172 18 Sep 2020 @ 1042 --- CraigC rising, about 2 feet below inner rim, strong boiling from north vent
16163 18 Sep 2020 @ 0738 --- CraigC as empty as I have ever observed, could not see the water level
16084 12 Sep 2020 @ 1106 --- TheHikingDude Pool full. gently boiling
16055 11 Sep 2020 @ 1007 --- CraigC full pool, boiling in north vent. 1020 small boil from south
13045 05 Aug 2019 @ 1737 --- KarlH Water is up approx 3 hours into Grotto eruption.
12103 04 Jul 2019 @ 0855 04 Jul 2019 @ 0900 Detour66 Spa is overflowing, left and center vents active.
11673 09 Jun 2019 @ 1318 --- User34 In overflow, boiling from all three vents
11537 03 Jun 2019 @ 0604 --- Kyle runoff channel is wet and water is pooled in sinter around the crater
11132 29 Apr 2019 @ 1516 --- Polly Spa up with strong bubbling from 2 vents and tiny intermittent bubbles from the third
10928 27 Jan 2019 @ 0845 --- Graham Full and blooping
10546 04 Oct 2018 @ 0827 --- William Water level high with two consistent areas of 2’ diameter boil in the center of pool.
10484 27 Sep 2018 @ 1904 --- Tara Overflowing and boiling from both vents.
10060 06 Sep 2018 @ 0917 --- Micah Kipple Rapidly filling with a constant boil in the left vent. Possible startup sequence.
9722 15 Aug 2018 @ 0820 --- c.barwin full and close to overflowing
9674 12 Aug 2018 @ 1004 --- Tom C. Spa was in overflow from 1004 through Grotto start (1019). Boiling in left vent only during this period.
8817 19 Jun 2018 @ 0945 --- Polly Spa full with one very small boil.
8968 08 Jun 2018 @ 1331 --- Polly Spa overflowing
8528 07 Jun 2018 @ 1600 --- Polly Spa filling quickly.
8232 18 May 2018 @ 2040 --- Tara Full and bubbling, recently started overflowing.
8156 11 May 2018 @ 1120 11 May 2018 @ 1126 Tara Rising slowly with frequent heavy bubbling.
8148 10 May 2018 @ 1910 10 May 2018 @ 1935 Tara Was overflowing and boiling at 1910; after Rocket, water was very calm and about 2 feet down with the level gradually dropping.
6365 14 Sep 2017 @ 0706 --- Graham Overflowing.
6253 10 Sep 2017 @ 0950 --- Polly Puddles around edges. Left Vent bubbly with some small burts.
4556 27 Jul 2017 @ 1335 27 Jul 2017 @ 1347 S.Glasser filling with decent boils from left vent, no chasms in water level in 10m
4086 12 May 2017 @ 1720 --- mhreed Low pool and boiling heavily from left vent. No right vent.
4019 29 Apr 2017 @ 1010 --- RMichaels In overflow (grotto off since ~0730).
2947 02 Jun 2016 @ 1449 --- BobInSLC empty but wet runoff channels
2813 04 May 2016 @ 1058 --- udo Post eruptive at 1058. Runoff channel wet, water level low. Water was high approx 0930.
2750 17 Apr 2016 @ 1700 --- RMichaels Spa was overflowing and had several widely spaced foot-high bubbles, but didn't progress to an actual eruption.
976 25 Jun 2008 @ 0000 25 Jun 2008 @ 2359 BoekelUpload ie most of day
853 03 Jul 2006 @ 0700 --- Tara Spa full and pulsating at 0700; one burst to about 5 feet seen but not in eruption.
16757 22 Oct 1998 @ 0000 22 Oct 1998 @ 2359 JarnoO active
16721 19 Sep 1998 @ 0000 19 Sep 1998 @ 2359 JarnoO ie; {no further details given}
15805 17 Feb 1997 @ 0000 17 Feb 1997 @ 2359 JarnoO active
15245 20 Jun 1996 @ 0000 20 Jun 1996 @ 2359 JarnoO active
14396 28 Sep 1995 @ 0000 28 Sep 1995 @ 2359 JarnoO active
14335 22 Jul 1995 @ 0000 22 Jul 1995 @ 2359 JarnoO active
14316 01 Jun 1995 @ 0000 01 Jun 1995 @ 2359 JarnoO active
14289 17 Mar 1995 @ 0000 17 Mar 1995 @ 2359 JarnoO active
12343 31 Oct 1993 @ 0815 --- JarnoO drained and finished at 0815
5581 22 Aug 1992 @ 0000 22 Aug 1992 @ 2359 JarnoO active
EntrySourceLinkComment
02 Jul 2016 @ 1927 JSJ https://www.flickr.com/photos/jsjgeology/27720902544 Photo (# 5 of 14) of Spa Geyser's evening eruption on 2 July 2016.
02 Jul 2016 @ 1927 JSJ https://www.youtube.com/watch?v=FrNewmxwSAI Video compilation of Spa Geyser's evening eruption on 2 July 2016.
07 Jul 1993 @ 1158 JSJ https://www.youtube.com/watch?v=ue3m3bxH15I Video by David Schwarz of Spa Geyser's late morning eruption on 7 July 1993.
28 Aug 2014 @ 1126 Micah Kipple https://www.flickr.com/photos/patrickcarneyphotography/15007379757 flickr.
BaselineDistance (ft)Description
Bike Path Towards Riverside 50On the trail headed towards Riverside